Mark,
Didn't you get an empty battery pack to use AA batteries in. If so, buy 8 Eneloop batteries made by
either Panasonic or Sanyo. I have never had an issue with batteries getting low and I use my GPS,
WM10, and back light continously. Any lithium ion battery can be charged at any point but it is not
good to take them off charge until they are fully charged. I recently bought a MAHA charger and it
came with 8 2700mah batteries. The model# is MH-C800S. It has the ability to make a soft (slow)
charge, it can make a fast charge, and it also has the ability to drain the batteries down to an almost
dead level and rejuvenate the batteries with a slow charge. The slow charge takes about 4 hours.
The fast charge takes about 2 hours, and the reconditioning cycle can take as much as 16 hours.
The reason I bought it is I had some old Ray-O-Vac I bought many years ago and tried the rejuvenation
procedure on them. I have now had them out for 3 two hour hunts and have plenty of power left. It will
charge 1 battery or how ever many you want to charge up to 8 at one time. However, regardless of the
charger, do yourself a favor and get the Eneloops. They are expensive but well worth it. A fully charged
battery will hold 85% of it's power for a period of 5 years on the shelf, "guaranteed". Sanyo first made
them overseas somewhere but has recently sold out to Panasonic in Columbus, Ga. I believe. I really
don't hunt but about 2 to 3 hours at a time but I hunt every day and I recently took them out to re-charge
them after having used them for my 3rd week just to try out this new charger. They did not need to be
replaced. A less expensive rechargeable battery is the Ray-O-Vac Plus that is even better than the
rechargeable Duracells. However, the plain rechargeable Ray-O-Vacs ain't much to them.
You should have received an empty battery pack with that detector that looks exactly like the rechargeable
battery pack.